21. It is a fundamental property of bearing surfaces and in general of sliding surfaces under load. 22. This was covered with a Teflon / fiberglass coating that provided a dry, low-friction bearing surface . 23. The Alusil aluminium alloy is commonly used to make oil, and is an excellent bearing surface . 24. This acidic build-up in the lubricating oil causes slow but ultimately damaging wear to bearing surfaces . 25. One of the main problems with joint replacements is wear of the bearing surfaces of components. 26. The inner spore-bearing surface , the hymenium, is purple to purple-brown, but lightens to brown in age. 27. In the worst cases, these air bearings consist of a concave bearing surface instead of a chamber. 28. The bearing surface of the bullet should ideally be seated as close as possible to the rifling. 29. The most recent data comparing the various bearing surfaces has shown no clinically significant differences in their performance. 30. The fluid film of the bearing is air that flows through the bearing itself to the bearing surface .
